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TLC551: Replace TLC551

Part Number: TLC551

Hello,

I have two PCBs, First one is good, but second one is defective.

I tested the defective board then I found the timer "TLC551CP" is defective, so I took this timer from good PCB and installed it in second PCB then it comes OK.

But I need two PCBs, so I bought a new timer and installed it on the PCB but it is not working, so I compared the resistance between pins of new timer with old timer (which I took from good PCB) and I found it is not same.

The code on old timer (which I took from good PCB) is "601 A N / TLC551CP:
The code on new timer is "64CDAM / TLC551CP

As the following picture:

Please help me to find solution for this problem.

Regards,